Blorb: A Z-Machine Resource Collection Format Stan
Format for sound and graphics in Z-Machine games. Includes sample C code to get started with.
Glk: An Interface Standard for Interactive Fiction
This I/O library maintains portability. Libraries are available for many systems.
The Blorb Resources Format
Format which embeds all needed resources for a given story into one file. Site describes perlBlorb and has one downloadable game to demonstrate the system.
The Z-Machine Standards Document
The fundamental information about how the Z-machine works.
Z-Machine Specification
The definitive guide to the Z-Machine. Get the highest version available. Currently, pdf and html formats are available.